Though no details of the plot have been released, Zellweger's on-screen love interest Colin Firth, who plays Mark Darcy in the films, revealed some details of a possible plot last year.

"I can tell you that Bridget and Mark can't have children, I think that's the way it goes on," Firth told EW reporter Dave Karger. "So then she makes the huge mistake of going back to Daniel Cleaver [Hugh Grant's character] for long enough to get pregnant. And I think he dumps her, and she's left stranded, and guess who comes back to rescue her?"

The first film, "Bridget Jone's Diary," hit theaters in 2001 and grossed $281 million internationally, while the 2004 sequel, "Bridget Jones: The Edge of Reason" earned $262, according to the trade magazine. Zellweger reportedly gained up to 20 pounds to play the role both times.

In March, Helen Fielding, who wrote the "Bridget Jones" novels which inspired the films, said she had begun working on a third book.

Zellweger has appeared in films like "Empire Records," "Jerry Maguire" "Chicago" and "Cold Mountain," which earned her an Oscar in 2003. The 42-year-old actress has most recently appeared in "Leatherheads" and "New in Town," which both performed poorly in the box office.